Q12:
Some species of Arctic birds are threatened by recent sharp increases in the population of snow geese, which breed in the Arctic and are displacing birds of less vigorous species. Although snow geese are a popular quarry for hunters in the southern regions where they winter, the hunting season ends if and when hunting has reduced the population by five percent, according to official estimates. Clearly, dropping this restriction would allow the other species to recover.
Which of the following, if true, most seriously undermines the argument?
Hunting limits for snow geese were imposed many years ago in response to a sharp decline in the population of snow geese.
It has been many years since the restriction led to the hunting season for snow geese being closed earlier than the scheduled date.
The number of snow geese taken by hunters each year has grown every year for several years.
As their population has increased, snow geese have recolonized wintering grounds that they had not used for several seasons.
In the snow goose’s winter habitats, the goose faces no significant natural predation.
提供的答案是B，但是B我觉得解释不同。每年狩猎季节会提前结束，因为5％的狩猎额限制很快就达到了，说明雪鹅很受猎人欢迎。如果开放标准，更多的雪鹅就会被捕杀。这正好帮助了其它动物的生存。措施达目的。not weaking at all.
看D，它说增加的雪鹅会自己去开辟新的根据地，那么就不会象提干中说的那样去displace birds of less vigorous species，换句话说，雪鹅的存在并没有对其它物种构成威胁。
大家评述。 | 
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
发表于 2005-12-12 08:46:00
楼主
